This one, a possible pond barrow in the south of Derk townland in County Limerick, has almost entirely erased itself from the landscape. A pond barrow is a type of Bronze Age funerary monument distinguished not by a raised mound but by a circular depression, sometimes water-filled, set within a low surrounding bank. What survives here, if it survives at all, is a shallow hollow roughly eight metres across, glimpsed on a Google Earth image taken in November 2018 but invisible on Ordnance Survey Ireland maps and undetectable on aerial photography from the mid-2000s. When the Archaeological Survey of Ireland visited in 2007, their surveyors recorded no surface remains whatsoever.

The site sits in reclaimed pasture, 875 metres east of the summit of Derk Hill, which rises to 781 feet above sea level. The fields around it are enclosed by drainage ditches, part of an estate landscape associated with Derk House, located about 650 metres to the north. That agricultural improvement is almost certainly what reduced the monument to its current state of near-invisibility. What makes the location more interesting, despite that, is its context within a wider prehistoric grouping. This is one of a cluster of fourteen barrows concentrated in the southern half of Derk townland, catalogued under several separate record numbers in the Sites and Monuments Record. The nearest of those companions sits just 70 metres to the north-west. The density of the cluster suggests this corner of County Limerick was a significant place in the Bronze Age, even if the ground today gives little indication of it. The record was compiled by Martin Fitzpatrick and uploaded in March 2021.

For a visitor, practical expectations need to be set carefully. The monument is not marked on any Ordnance Survey map, and the land is enclosed agricultural pasture associated with a private estate. There is no formal access, and even with permission to enter the field, finding a shallow depression of around eight metres in diameter within a flat, drained pastoral landscape would test the most patient observer. The site is more meaningful as part of the wider barrow cluster than as a standalone destination, and anyone seriously interested in the group would do well to cross-reference the various SMR numbers with the National Monuments Service mapping portal before attempting to locate any of them on the ground.